When the sun is shining and electricity consumption is low, Austria quickly generates more electricity than can be stored. Such days, like Easter Monday, are a problem for the power grid, warns Gerhard Christiner, spokesman for the board of Austrian Power Grid (APG), the Austrian transmission system operator. “In recent years we have seen a strong expansion of solar. However, we have not followed suit with the rest of the system,” he criticizes. Grid expansion is lagging behind the expansion of renewables.